JP2001018719A - Motor-driven stowable mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven stowable mirror being structurally simple, free from play, and having a function unaffected by external forces. SOLUTION: This motor-driven stowable mirror includes: an output shaft 5 driven by power from a motor 3 within a casing 2 mounted in a vehicle body; a rotating plate 13 having the base end of a mirror support arm attached thereto and rotated by the output shaft 5; a clutch 10 for connecting and disconnecting the rotating plate 13 to and from the output shaft 5; and a coil spring 15 for energizing the clutch 10 with a force transmitted. When an external force acts on the mirror support arm, the rotating plate 13 to which the mirror support arm is attached is disconnected from the output shaft 5 by the clutch 10 part and can be rotated. The clutch 10 is multiple disc clutch such that the rotating force transmitted to the output shaft 5 from the rotating plate 13 to which the base end of the mirror support arm is attached is greater than the rotating force transmitted from the output shaft 5 to the rotating plate 13 to which the base end of the mirror support arm is attached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric retractable mirror mainly used for a large vehicle or the like.

[0002]

2. Description of the Related Art Conventionally, in an electric mirror mounted on the outside of a vehicle body, an arm supporting the mirror is rotated in a range from a storage position to a use position by driving a motor. However, the mirror and the support arm thereof are also rotatable in response to an external force applied from the outside, and have a function of preventing damage to the support arm and the like.

[0003] In view of the above, a motor-driven mirror generally has a drive unit and a mirror supported by a motor inside a casing which accommodates the drive unit and a support structure and is mounted on a vehicle body. A clutch mechanism is provided between the arm and the rotation supporting portion that rotatably supports the arm, and is mainly designed so that the influence of an external force does not affect the driving portion. As an electric mirror having such a configuration, for example, a mirror described in Japanese Utility Model Publication No. 6-30565 is known.

In the above-mentioned electric mirror, a flange plate is provided at a base end of an arm (stay) for supporting the mirror, and a friction plate clutch is provided below the flange plate as a first clutch. In addition, a ball is inserted into a plurality of recesses as a second clutch at a connection portion between a driven gear that transmits a driving force from a motor and an output shaft at a lower portion of the output shaft for transmitting and supporting the rotational force. A structure in which an interposed ball clutch is provided, and a coil spring that generates an axial biasing force for imparting the clutch function to the friction plate type clutch and the ball clutch is fitted to the output shaft and interposed. Have been. And
In order to regulate the rotation range between the use position and the retracted position of the support arm of the mirror, a part of a bolt for fixing the stationary clutch plate of the first clutch to the casing is protruded to move the clutch plate on the movable side. In this case, it is shown that the rotation range provided in the first embodiment can be restricted by engaging with a circular arc groove that allows the rotation range.

[0005]

In the electric mirror having such a configuration, the driving force of the motor can be transmitted to the support arm of the mirror, and when the mirror receives an external force directly, the motor is driven by the motor. In order to allow the support arm to rotate independently of driving, it is necessary to provide clutches at two places as described above. Therefore, it is inevitable that the structure becomes complicated.

In addition, since different types of clutches are used, such as a ball clutch and a friction plate type clutch, there is a problem that the number of parts is inevitably increased and the manufacturing cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem. An electric retractable mirror having a function of simplifying the structure and having a function that is not affected by external force without occurrence of backlash is provided. It is intended to provide.

[0008]

In order to achieve the above-mentioned object, an electric retractable mirror according to the present invention comprises an output shaft driven by power from a motor in a casing mounted on a vehicle body. A rotating plate attached to a base end of a mirror supporting arm and rotated by the output shaft, a clutch for connecting / disconnecting the rotating plate and the output shaft, and a spring for urging a transmission force to the clutch A body, wherein when an external force is applied to the mirror support arm, the rotating plate to which the mirror support arm is attached can be rotated by disconnecting the output shaft at the clutch unit. The clutch is configured such that the rotation transmission force from the output shaft side to the rotating plate side at which the base end of the mirror support arm is attached, the rotation transmission force from the rotating plate side at which the base end of the mirror support arm is attached to the output shaft side. It is characterized in that a multi-plate clutch configured rolling transmitting force increases relationship.

According to the present invention, the clutch is connected to the
Can be provided in a single place, and use the thrust of one spring body to make a difference in the rotation transmission force.
The contact resistance on the other friction surface can be changed with respect to the contact resistance on the other friction surface, or the friction force can be made different by increasing the contact resistance on the other friction surface. The object can be achieved, and there is an effect that the overall configuration can be simplified, the manufacturing cost can be reduced, and the cost can be reduced.

In the clutch according to the present invention, the output shaft protrudes from an upper portion of the casing and is connected to the base end of the mirror support arm, and a required diameter is provided on the clutch support seat of the casing coaxially with the output shaft. The first friction plate is fitted and set, and via a clutch plate that rotates integrally with the output shaft, on the opposite side, the output shaft end flange portion is coaxially integrated with the second friction plate. A rotating plate that is engaged and cannot be disengaged, is rotatably supported, and is urged with a frictional force higher than the frictional force of the first friction plate, is disposed on the rotating plate. Is preferably fixed so that the thrust by the coil spring fitted on the intermediate portion of the output shaft via the rotary plate is urged to the contact surface between each friction plate and the clutch plate. . By doing so, the clutch parts can be compactly assembled, and the transmission of power can be divided into the inside and the outside, and can be operated without difficulty.

A rotating cam is arranged on an output shaft at a reaction force receiving portion of a clutch transmitting force by a coil spring in an upper portion of the casing, and a switch is operated by the rotating cam to control the driving of the motor, so that a mirror support arm is provided. It is preferable to regulate the drive rotation range of the motor. In this case, since the switch (for example, a micro switch) is disposed in the upper portion of the casing, the rotation range of the mirror support arm can be effectively regulated without causing a malfunction due to penetration of the casing such as rainwater. . In addition, in addition to such electric regulation, an arc-shaped notch portion is provided on the clutch plate of the clutch within a required rotation angle range, and a stopper is provided on a part of the clutch disposing portion of the casing. The mirror support arm may be engaged with a notch of the clutch plate to regulate a driving rotation range of the mirror support arm. In this way, more security can be ensured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the electric retractable mirror according to the present invention will be described with reference to the drawings.

FIG. 1 is an overall external view of the electric retractable mirror according to the present embodiment, FIG. 2 is a longitudinal sectional view of a main part, and FIG.
XX view in FIG.

As shown in FIG. 1, the electric retractable mirror 1 of this embodiment has a mounting seat 26 protrudingly provided on the upper surface of a casing 2 of a required shape and size having a mounting seat mounted at an appropriate position on the vehicle body A. The mirror support arm 30 is mounted on the base with the seat plate 31 at the base end fixed. The mirror 33 has a well-known structure, and the movable end 3 of the mirror support arm 30 is provided.
2 attached. In addition, about the mirror 33,
Depending on the vehicle to be used, one having an arbitrary size and shape is used. In the drawing, reference numeral 34 denotes an upper end support portion of the mirror support arm 30, which is rotatably supported by a bracket 35 provided above the vehicle body A.

In the electric retractable mirror 1 of this embodiment, a motor 3 having a reduction gear mechanism 4 is provided in one side of the inside of a casing 2 attached to an appropriate position of the vehicle body A as described above. 3 and required dimensions apart from casing 2
An output shaft 5 penetrating up and down is provided, and a clutch 10 is provided at a protruding end of the output shaft 5 at an upper portion of the casing 2.
A mounting seat 26 is disposed on an upper surface of a rotary plate 13 disposed on the output side of the clutch 10 and a cover 25 covering the clutch 10, and a base end seat plate 31 of a mirror support arm 30 is connected to the mounting seat 26. It is supposed to be.

The clutch 10 provided at the upper end of the output shaft 5 has a clutch support seat 6 provided with one surface (lower surface) of a clutch plate 11 attached to the output shaft 5 projecting from the upper surface of the casing 2. A rotating plate 13 which is brought into contact with a first friction plate 12 which is fitted and fixed in the recess 6a and whose other surface of the clutch plate 11 is rotatably supported by the end of the output shaft 5.
Has a multi-plate structure that is brought into contact with the second friction plate 14 fixed to the lower surface. The second friction plate 14 is provided with a friction plate made of a material having a higher coefficient of friction than the first friction plate 12, and has a contact pressure larger than that of the first friction plate 12.
In other words, the transmission torque on the second friction plate 14 side is set to be larger than that of the first friction plate 12.
Further, contact resistance between the flange 5a at the output shaft end and the receiving recess 13a provided on the rotating plate 13 is added to the rotating plate 13 side.

The lower end of the output shaft 5 is supported by a bearing 7a provided on a bottom cover 2b constituting the casing 2, and the upper portion is supported by a bearing 7b provided on an upper cover 2a constituting the casing 2. A lower end gear 9 to which a driving force is transmitted by a gear train 8 from an output portion of a reduction gear mechanism 4 attached to the motor 3 is attached to a lower portion, and an inner surface of the upper cover 2a of the casing 2 and the output portion at an intermediate portion. A thrust is always exerted downward by a coil spring 15 interposed between the lower surface of the shaft 5 and the upper surface of the gear 9. The upper end of the coil spring 15 is provided with a thrust bearing 16 and a rotating cam 17 for regulating the rotation range so that the rotation by the thrust between the coil spring 15 and the inner surface of the upper cover 2a is not hindered. I have. The gear 9 attached to the lower end of the output shaft 5 is prevented from coming off by a nut 18 screwed into a screw portion provided at the lower end of the output shaft 5, and the output shaft 5 is formed on the side surface of the shaft. A hole that matches a partially circular outer shape formed by cutting a part is fitted to prevent rotation. The same applies to the clutch plate 11.

The rotating plate 13 of the clutch 10 is
Collar 5 provided at the upper end of output shaft 5
a is fitted so that the rotational force from the clutch plate 11 is transmitted via the second friction plate 14 fixed to the lower surface, and the thrust by the coil spring 15 is applied. The power is transmitted to the clutch plate 11 so that the rotating plate 13 and the clutch plate 11 rotate together at normal times. On the upper surface of the rotating plate 13, stud bolts 19 are planted in a required number (three in the specific example) in a required distribution. The base end seat plate 3 of the mirror support arm 30 is attached to the mounting seat 26 by the stud bolt 19 and the nut.
1 is fastened and fixed.

A stopper 21 is vertically provided on the lower surface of the rotary plate 13 near the outer periphery thereof, and a part of the outer peripheral edge of the upper surface of the clutch support seat 6 provided on the upper cover 2a of the casing 2 is provided in a required section ( The notch (from the storage position along the side of the vehicle body to the overhang position on the side of the vehicle body during use) is notched, and the stopper 21 is engaged with this notch (illustration is omitted) to allow external The rotation range is regulated by a required rotation angle. Regarding the regulation of the rotation range, the rotation cam 17 operates limit switches 22 and 23 disposed on the inner surface of the upper cover 2a of the casing to stop driving by the motor 3 at the limit position. .

The base plate 3 at the base end of the mirror support arm 30
1 is formed on the upper surface of a cover 25 that covers the outside of the clutch 10. This cover 25 is an O-ring 27 fitted between the inner surface of the lower part of the peripheral wall and the outer periphery of the clutch support seat 6 on the casing side. (Sealing ring) prevents rainwater and dust from entering the clutch 10 portion. In the drawing, reference numeral 28 denotes a spacer ring for preventing the O-ring from floating, and reference numeral 29 denotes an electric wire insertion portion for the motor and the limit switch.

When the electric retractable mirror 1 according to the present embodiment is used, the mirror 32 is stored in a preset rotation angle range by operating a switch at the driver's seat in the same manner as the conventional one. From the mirror to the use position 3
It is used by rotating 0 to protrude to the side of the vehicle body A.
Further, during storage, it is stored along the vehicle body side from the use position.

When the mirror support arm 30 is rotated from the use position to the retracted position or vice versa, power is transmitted to the gear 9 via the gear train 8 by driving the motor 3 to move the output shaft 5 to a predetermined position. It rotates at the speed of. This output shaft 5
Is transmitted to the rotating plate 13 via the clutch 10 provided at the upper end thereof, and the base end seat plate 31 attached to the attaching seat 26 on the cover 25 which rotates integrally with the rotating plate 13 is moved. Then, the mirror support arm 30 is rotated.

When a turning power is externally applied to the mirror support arm 30 during the turning operation or use of the mirror support arm 30, the rotating plate 13 is rotated by the mirror support arm 30. become.
When the rotating power from the mirror support arm 30 is applied to the rotating plate 13, the clutch 1 provided on the upper part of the output shaft 5
0 indicates that the clutch plate 11 is sandwiched between the first friction plate 12 and the second friction plate 14 by the urging force of the coil spring 15,
While being in contact with both of the friction plates 12, 14,
A larger braking force is applied to receive reverse rotation resistance while being connected to the reduction gear mechanism 4 on the motor 3 side via the gear train 8 that meshes with the gear 9 attached to the output shaft 5. On the other hand, the rotating plate 13 is provided with the second friction plate 1 provided integrally.
4 and clutch plate 11 and flange 5a at output shaft end
And only the contact at the receiving recess 13a is added, so that the rotary plate 1 movably supported at the end of the output shaft 5
It is rotated only on the third side, and external turning power is cut off by the clutch 10 so that external force does not directly affect the drive unit. Therefore, even if an unreasonable external force acts on the mirror support arm 30, it can be used without failure.

During normal driving operation, the clutch 10 is integrated with the second friction plate 14 having a contact pressure higher than the contact pressure with the first friction plate 12 acting directly on the clutch plate 11 at the clutch 10 as described above. The rotation plate 13 is rotated by receiving the rotation force of the output shaft 5 to rotate the mirror support arm 30 to a required position. During the turning operation of the mirror support arm 30, an appropriate braking force is constantly urged by the first friction plate 12, so that when the mirror support arm 30 is turned to move from the storage position to the use position, it is needless to say. ,
Since there is no backlash in the use state and the apparatus is kept stationary, the mirror surface does not swing. And
The first friction plate 1 fixed to the clutch plate 11 is provided on the rotating plate 13 that directly supports the mirror support arm 30.
The frictional force between the second friction plate 14 and the flange portion 5a, the contact friction force of which is increased, and the braking force due to the contact pressure between the flange portion 5a and the receiving recess 13a is stably held, and the rotation does not occur unnecessarily.

Further, in this embodiment, the first friction plate and the second friction plate 14 fixed to the output shaft 5 in the clutch 6 at the recess 6a of the clutch receiving portion 6 of the casing 2 at normal times.
Therefore, the mirror support arm 30 can be kept stationary at the required use position without swinging since the mirror support arm 30 does not swing.
As described above, the electric retractable mirror 1 of the present embodiment uses the clutch provided in one place to protect the drive unit by the rotational force received from the outside as well as the rotational operation from the motor side. Not only that, it also has an excellent function that all the stable holding in the stationary state can be surely performed.

In this embodiment, in addition to the function of the clutch 10, a rotary cam 17 for regulating the rotation angle on the output shaft 5 is provided. , 23 are provided along the lower surface of the casing upper portion 2a, so that it is possible to prevent the water from getting wet due to the intrusion of rainwater during use.

In the above description, the first friction plate 1 with respect to the clutch plate 11 attached to the output shaft 5 is configured as the clutch 10.
Although the contact pressure is made different by using different materials for the second and second friction plates 14, the contact area of the second friction plate is reduced to increase the contact pressure per unit area. The same effect can be obtained by performing the above operation.

In this embodiment, the coil spring 15 corresponds to the spring body of the present invention, and the base end seat plate 31 of the mirror support arm corresponds to the base end of the mirror support arm.

[Brief description of the drawings]

FIG. 1 is an overall external perspective view of an electric retractable mirror according to the present embodiment.

FIG. 2 is a longitudinal sectional view of a main part.

FIG. 3 is a view taken along line XX in FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 electric retractable mirror 2 casing 2a upper cover of casing 3 motor 5 output shaft 5a flange at output shaft end 6 clutch support seat 7a, 7b bearing 9 terminal gear 10 clutch 11 clutch plate 12 first friction plate 13 rotating plate 13a Receiving recess of output shaft flange 14 Second friction plate 15 Coil spring 16 Thrust bearing 17 Rotating cam 19 Stud bolt 21 Stopper 22, 23 Limit switch 25 Cover 26 Mounting seat 30 Mirror support arm 31 Base end seat plate of mirror support arm 33 mirror

Claims (3)

[Claims] An output shaft driven by power from a motor in a casing attached to a vehicle body, a rotating plate attached to a base end of a mirror support arm and rotated by the output shaft, and a rotating plate. A clutch for connecting / disconnecting the output shaft, and a spring for urging the clutch to transmit power; when an external force is applied to the mirror support arm, the rotating plate for attaching the mirror support arm is provided with the clutch. In the electric retractable mirror configured to be rotatable by disconnecting the connection with the output shaft at the portion, the clutch is configured to reduce a rotational transmission force from the output shaft side to the rotating plate side to which the base end of the mirror support arm is attached. On the other hand, an electric retractable mirror characterized in that it is a multi-plate clutch configured such that the rotation transmitting force from the rotating plate side to the output shaft side is increased when the base end of the mirror supporting arm is attached. 2. The clutch according to claim 1, wherein an output shaft is protruded from an upper portion of the casing and connected to a base end of a mirror support arm. With the friction plate set and fitted,
On the opposite side, a clutch plate that rotates integrally with the output shaft and coaxially engages with the output shaft end flange portion integrally with the second friction plate and is rotatably supported without coming out. And a rotating plate that is biased by a frictional force higher than the frictional force of the first frictional plate is disposed, and the base end of the mirror support arm is fixed to the rotating plate so that the rotating plate is fixed to the rotating plate. 2. The electric retractable mirror according to claim 1, wherein a thrust by a coil spring fitted on an intermediate portion of the output shaft is urged to a contact surface between each friction plate and the clutch plate via the output shaft. 3. 3. A mirror support arm, wherein a rotating cam is arranged on an output shaft at a reaction force receiving portion of a clutch transmitting force by a coil spring in an upper portion of a casing, and a switch is operated by the rotating cam to control driving of a motor. 2. The electric retractable mirror according to claim 1, wherein the drive rotation range is regulated.